A drop ejector array device includes a first plurality and a second plurality of drop ejectors that are alternatingly disposed along an array direction on the substrate surface. A voltage input terminal and a current return terminal are disposed on the substrate surface. A first power bus line connects the first plurality to the voltage input terminal. A second power bus line connects the second plurality to the voltage input terminal. The second power bus line is electrically connected to the first power bus line by a primary power bus connector line. A first current return bus line connects the first plurality to the current return terminal. A second current return bus line connects the second plurality to the current return terminal. The second current return bus line is electrically connected to the first current return bus line by a primary current return bus connector line.

In example implementations, an apparatus is provided. The apparatus includes a power supply, a first switch coupled, a second switch, and a second resistor. The first switch is coupled to the power supply and a low voltage control block. The second switch is coupled to the power supply and the first switch. The second resistor is coupled to the second switch to generate heat in response to being energized. The first switch is to control activation of the second switch via a fire signal from the low voltage control block and through the first resistor to energize the second resistor and cause a nozzle chamber to dispense a printing fluid.

In example implementations, an apparatus is provided. The apparatus includes a power supply, a first switch coupled to the power supply, a second switch coupled to the first switch, a third switch coupled to the power supply, the first switch, and the second switch, and a resistor coupled to the third switch. The first switch is to be controlled via a high voltage logic. The second switch is to be controlled via a low voltage logic. The resistor is to generate heat when energized. The first switch and the second switch are to control activation of the third switch to energize the resistor and cause a nozzle chamber to dispense a printing fluid.

The present invention is targeted at suppressing ringing and overvoltage. A driver circuit (200) drives a plurality of loads (Z.sub.1 to Z.sub.N). A plurality of output terminals (Po.sub.1 to Po.sub.N) are connected to the plurality of loads (Z.sub.1 to Z.sub.N). A plurality of drivers (Dr.sub.1 to Dr.sub.N) correspond to the plurality output terminals (Po.sub.1 to PO.sub.N), and generate driving signals (Vo.sub.#) applied to the respectively corresponding load (Z.sub.#). A plurality of clamp circuits (260_1 to 260_N) correspond to the plurality of drivers (Dr.sub.1 to Dr.sub.N), and include Schottky diodes (SD) connected to input nodes or output nodes of the respectively corresponding drivers (Dr).

A liquid discharging apparatus has an integrated circuit that controls supply of a driving signal to a first driving element and to a second driving element according to a discharge control signal. The integrated circuit has: a first switch circuit that receives the driving signal and switches between output and non-output of the driving signal to the first driving element; a second switch circuit that receives the driving signal and switches between output and non-output of the driving signal to the second driving element; and a switch control circuit that receives the discharge control signal and controls whether to cause each of the first switch circuit and the second switch circuit to output the driving signal. The switch control circuit controls the first switch circuit and the second switch circuit according to the first data.

A printing apparatus includes: a variable resistance circuit including a plurality of resistors intercoupled and one or more drive elements that feed currents through the respective resistors; an optical sensor coupled to the variable resistance circuit; a shift register that outputs signals to select one or more of the drive elements and to turn on the selected drive elements; and a controller that acquires a detection value of the optical sensor and that controls the shift register based on the detection value.

A liquid ejection apparatus includes a liquid ejection head that ejects a liquid by driving a drive element, a drive signal output circuit that outputs a drive signal for driving the drive element, and a substrate provided with the drive signal output circuit, wherein the drive signal output circuit includes a modulation circuit that modulates an original drive signal to output a modulation signal, an amplifier circuit that amplifies the modulation signal to output an amplified modulation signal, and a demodulation circuit that demodulates the amplified modulation signal to output the drive signal for driving the drive element, and wherein the demodulation circuit is located, on the substrate, between the modulation circuit and the amplifier circuit.

A drive circuit includes a first voltage output circuit coupled to a first terminal and outputting a first voltage signal, a second voltage output circuit coupled to a second terminal and outputting a second voltage signal, and a drive signal output circuit coupled to the first terminal and outputting a drive signal. In a first mode, the second voltage output circuit outputs the second voltage signal and the drive signal output circuit outputs the drive signal whose voltage value varies. In a second mode, the second voltage output circuit outputs the second voltage signal and the drive signal output circuit outputs the drive signal which is constant at a third voltage value. In a third mode, the first voltage output circuit outputs the first voltage signal and the second voltage output circuit outputs the second voltage signal.

A driving circuit includes an amplification circuit configured to output an amplified modulation signal from a first output point and a level shift circuit configured to output a level-shift amplified modulation signal from a second output point. The level shift circuit includes a second gate driver that outputs a third gate signal and a fourth gate signal, a third transistor, and a fourth transistor. The second gate driver outputs, when a potential of a base driving signal is lower than a predetermined potential, the third gate signal for controlling the third transistor to be conductive and the fourth gate signal for controlling the fourth transistor to be nonconductive, and when a potential of the base driving signal is higher than the predetermined potential, the third gate signal for controlling the third transistor to be nonconductive and the fourth gate signal for controlling the fourth transistor to be conductive.

A driving circuit includes an amplification circuit configured to output an amplified modulation signal and a level shift circuit. The level shift circuit includes a second gate driver that outputs a third gate signal and a fourth gate signal, a third transistor that operates based on the third gate signal, and a fourth transistor that operates based on the fourth gate signal. The second gate driver outputs the third gate signal for controlling the third transistor to be conductive and the fourth gate signal for controlling the fourth transistor to be nonconductive in a second period in which a driving signal is fixed in a second potential that is higher than a first potential and lower than a third potential and the fourth gate signal for controlling the fourth transistor to be nonconductive.